Rotary cutter-head.



E. S. SHIMER.

PATENTBD DEC. 24, 190'?.

ROTARY GUTTER HEAD. APPLICATION FILED nu 24. 1907.

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'N0b874'871' PATENTBI@ #L B.s.sHIMER DE 24 wu ROTARY GUTTER HEAD.

APPLICATION FILED MAY 24. 1907.

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No. 374,871. PATBNTBD DB0. 24, 19o?.

E. s. SHIMER.

ROTARY GUTTER HEAD.

APPLIOATlON FILED MAY 24. 1907.

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UNITED srnrnsrnfrnnr OFFICE.

ELMEP. si sHninaoFMiL'roN,PENNsYLvA'NL/i, VAssieiroia fro SAMUEL J. snnirinaitn sons,

, IN'coRroRATED,y OFMijLfrON,PENNSYLVANIA.

To all whom it mag/concern:

Be it known that I, ELMER S. SHIMER, a citizen of the United States, residing at `Milton, in the county 'of Northumberland and State of Pei'insylvania, have invented certain 'new anduseiul Improvements in Rotary Cutter-Heads, of which the following isto enable them to A Witlistandthe strain t'o which they are subjected during operation.

The use of thin steel blades in 'cutter heads is desirable for several reasons, among which may be named the considerable difference in .cost between light, tliin and `thick, heavy blades, which is obviously in favor of the former. yThe light thin blades may y.be

ground or sharpened and kept in lgood con.-A dition inore easily and at less expense than 'the heavier blades..- .vThe light blades may also, as a rule, be more easily and conveniently fitted and adjusted for'operation. On the other hand the`lighter and thinner the blades have been made, the greater has been the liability to breakage and injury. Some difficulty has also been experienced in clamping and securing a lverythin blade or bit with the requisite degree of'iirmness and security.

In view of the foregoing facts, the present invention has for vits obiect to provide impro-ved means for securing or vmounting light, thin cutting blades or bits in a, rotar .cutter he ad,'1n such a manner that they wi 1 be absolutely secure; that they'may be easily detached for sharpening or other purposes; that they may be kreadily and quickly adliusted so as to present their cutting edges in' precisely the`proper plane;l and thateach blade shallbe strongly re-inforced VA further object of the invention is topprovide'a bit holder which shall possess superior advantages in' pointof simplicit durability and general efiiciency, and -1n W ich shall be included that portion 'of thev cuttery which is lknown. as `the chip-break, so that,- wh'en the. latter becomes worn, or injured, it may be` re -laced without discardingthe cutter head.' urther objects of theyiiiventionv are r to simplify `-and to improve "the construction and operation'ofclassofffdevices. 1f

Specification ofLetters Patent. `Application iled May 24; 1907. Serial No. 375 .4:79.

shape, it being provi .y nornnr corren-:m4n

With these and other ends in view, which will readily appear as the nature of the invention is better understood, the same consists in the improved construction and novel arrangement and combination of parts, which will be hereinafter fully described and particularly pointed out in the claims.

In ythe accompanying drawings has been illustrated a simple and preferred forniy of `the invention; it beng, however, understood that no limitation is necessarily -made to `the precise structural details therein exhibited, but that changes, alterations and modiications. within the scope oi theinvention may be lresorted to when desired.'

- In .the drawings-Figure 1. is a side elevation of arotary cutter-head embodying the invention. Fig. 2 is a top plan view ofthe same. Fig. 3 is a vertical sectional view taken on the plane indioated'by line 3 3 in Fig. 2. Fig. 1-isa horizontal sectional view ktaken on the planel indicated by the line 4-4- in Fig.. 1, and showing the bits or blades A clamped in the holders and the latter secured in this cutter head in position for operation. F ig.l is a horizontal sectional detail view taken on a plane similar to Fig. 4, through a portion of the cutter head and'one' of the bit holders,l but showing the' latter loosely engaging the body of the cutter head. Fig. 6 is a perspectiv'e view showing one 'of the bit holders detached, the bit having been removed therefrom. Fig. is a perspective view of one ofthe bit holders'with the bit in position therein, and showing also a gage for the adjustment ofthe bit.

view of the gage, detached.

l Patented Dec. 24,1907. l

Fig. 8 is i-detail Corresponding parts in the several'iigures.,

are. denoted 'by like characters of references. The body 1, ofthe 'improved cutter head is of the approvedapprxinltly Cylillldl'iplture 2, for the assage of the. shaftormmipdrel upon whic ,itis to be mound-,ed for op:

v eration...

The body i, is-.pmvi'ded ,withiongitiidinai ooves or recesses A, affordingseats for the it holders B; Within. the sco e of the invention the ctter maybe provi ed with any desired number of bits, eachl mounted in a holder .engaging a recess in the cutter head; .in the 'accompanying illustration `al cutter head has beenshpWn provided with four bits or hold'ei's, ,which are mounted in recesses iormed at equal distances apart;

when in operation. Portions of the.

:Each of the recesses A is provided in its rear wall With a longitudinal groove 3, land the bottom of each :recess is provided adjan cent tothe rear Wall with an oii'set forming `a distinct groove 4 it being understood 'that the term rear Wallis used with reference to Athe dlrectlon 1n which the cutter head roformed of a block` of `metal of suitable dimenf sions, the width being equal tov the width of. the bottom grooves l of lthe recesses. A,, .wherein the said blocks-are fitted, as willbe very clearly seen in Figs. 2- and el of the draws.

ing.v Each of the blocks B, -is provided with a longitudinal bit-receiving groove 6, extendlng through the entire length thereof inte`ri mediate the front and rearsides, each of said blocks is furthergprovided with a longitudi--y nal rib 7 formed on the rear side thereof forv engagement with the grooves 3 'of the recesses A. The front Wall of each of the bit holdersisprovided with'threaded apertures i is fitted in the slot 6 of the h'older..

8,'for the passage of clamping screws 9, and the back ofzeach' of the bit holders-is pro-- vided with threaded apertures 10,- for the reception of the adjusting screws 11, bearing 'against the back of the blade or bit 1.2, which In the accompanying drawings, each bit holder has been shown provided with two clamping screws 9, yand vthe rearzwallof each 0f said holders is provided with al slot 1,5', whereby it is divided'into separate leaves 16,' each having an Aindividual clamping screw; it is to be understood that when additional Aclamping serewsare"employed the back wall of the holder will be provided with additional slots so thatffeaclrclam ing screw. will lbe mounted in an individua A`leaf or section :of Vthe' back' wall of the holder.'y v. The clamping screws are providedwith heads'l Tgwhichf are of polygonal 'shape so astoaffordseats for an' ordinaryl wrench by m'eans-ofnvhich said V gage C bylirieansof which the bit or blade'j screws may be adjusted ;A it will furthermore. be'noted thatthe outerfaces vof the heads 1,7

are convexedv orrounded 'for convenentengagement with the front walls 'ofi tle:.re

may be accurately -iitted in I the hol-derain such a manner that the' cutting-edge will prloof theplate 1K2'. By adjusting 'the'gage upn: the holder,- as shown' in Fig'. 'hef the draw-1 ject precisely the requisitev distance said gage consists of a spider or body 1 8 ,having lateral y extendingarms 19, 1 9 and- 20, which .are spaced apart a' distance equal to the distance between thebaek of the liolderB and the edge ings, the arms 19 will constitute a stop to prevent the cutting edge from advancing eyond` a predetermined point; thus, by manipulating thel adjusting screws 11, the bit or blade will be forced outward in the slot 6"until the cutting edge projects the desired distance beyond the holder, when it l'will be checked by contact withthe'arms 19. By this simple device, the blade or bit may be very quickly adjusted and this device Will obviously be found extremely luse-l ful whenever the blades 'or bits are to he re-adjusted after being sharpened, to enable proper adjustment to be made to compensate for the material -lost yin sharpening or grinding. Thus by thissimple device, the blades may be almost linstantaneously fitted in a true .and correct position, and the .effieiency'of theuttcr head will thereby be largely increased-;

When v the. holders tached .from the I'cutter head, the bits or bladesmay be` Securedtlierein by tightening the clamping screwsA 9,l as` will be readilyunderstood. While the said screws are. tigl1tened,-the holder B may readily be adjusted in itsappropriate recesses A b v sliding .it endwiseinto the. groove-4 of said recess, the 4tongue o r rib` 7 upon the rear .ofthe .holder engaging the greove 3, so that the holder Will be verysecurely retained,

and `refinforced against the llateral s t'rain to which .it is. subjected during operation.

. After the holder has moved or adj usted to its proper posi-tion .clamping screws are turned outward in-,the threaded vapertures n,'\vl1ich they. are.v 'respectively1nou1rted, until the convex faces of said screws engage the front walls` of the recesses Aj. b v tightening' the endsofthe screws,v up against the/wall of the recesses 'thefrnt wall of theliold'er will be forcedin-the directionef Lthe bit or blade 12, which will thus be clamped securely 'between the ffront i Aand- .r ear vwalls o'f the holder `B`whilethe .latteris ybodily forced in the-dir ection Gf the. rear ,wall'of the recess A, Whereit will Vbe ,frietioually retained with great security. Thus it will'be noted that theA bits Orbladesare secured in lojxrative position,.y not by, actual i engagement with the clamping, screws, bnt' byA being.I 'clampet betweeuthe lrearwalls and 4the leaves '16, constituting the Afront walls' ofthe holders B; thus, practically,v the entirey surface of the; bitswillwbe clampethand the 'said Ab' 's willl be held far incre sccnrelygandfwith'le danger of 'breaking down 'unfder a 'heavy strain,l thanI4 if r'they were held `by"direct engagement withclamping' screws'r similar securing devices.

The outer edges of the'baclifwalls' of the bitholders are concaved 4to. lformy vthe' chip break 21; -,In fall cutter heads, the "chip break, whichvisthatfV ortion which" is inlinediatelyedjacent to tie front side of the bit or cutter is particularly exposed' to wear' B are removedl or de? iso and to .injury excessively worn, vit may be lrenewed b` `simply substituting a new bit holder, .the-f and cutter heads frequently-'x have to be discarded owing to` excessive wear .of these parts. .By thepresent invention,l as soon as -the chip 'break4 becomes` body ofthe cutter'head remainingintact.

This is anadvant'age which will be readily `appreciated by; those skilled-.in the art to which this invention f The. operationand a appertains.

vantages of this invention will be readily understoodfrom the .foregoing description taken in connection with the drawings hereto annexed. -Usually v'such blades are held in in cutter `heads where thinv blades are used, position by vclamping devices whereby said blades are 'clamped upon the head direct makingthe adjustment vand replaced 4by others in a few minutes inconvenient and tedious, and' by no means very efficient.. By the -present invention, very. thin blades or bits may be advantageously applied,.and such bits or blades may be easily, quickly and accurately adjusted, and-will be retained by the holders ina very time, thus avoiding the loss of time, 1 and enabling work to be continued practically Without delay; this, it will be understood,

is an extremely important and valuable feature of the invention. The bit holders are so'constructed and arranged that, in the event of accident to the holder o r to the bit, a new piece can be inserted Without loss of the entire head, or inconvenience caused by delay.

The bit holder B is preferably provided with a narrrow slot or groove 22, extending from the bottoni of the bit receiving groove in the direction of the back of the block '-constituting the holder, which .is thereby renderedsuiiiciently iexible or resilient to enable the clamping jaws formed by the front .and rear walls of the holder to get a `iirm gr'p upon the bit under the tension of the clamping screws 9. f

I claim l 1. A cutter head. having alongitudinal recess, a longitudinally slotted bit holder slidably engaging'the recess, a blade or bit held in the slot and clamping screws engag ing the bit holder and having heads adapted for Vengagement with one wall of the recess.

2.' 'cutter ,head having a longitudinal recess provided with grooves or offsets, a longitudinally slotted bit holder slidably engaging the recess and having portions engaging the groovesor offsets, a blade or blt held in the slot and clamping screws engaging the bit holder and adaptedto be tightened against one 'wall of therecess.

`39A cutter head havingf a Elngitudinal recess,n v a bit holder engaging .thef-reccss and having; ya longitudinal I bit receiving groove, and clamping screws extending. through. one

y .wall.;k ofthe bit.l holder an'd.liaving 'heads adapted for engagement I with: one wall :off the recess.-' f i w-f f 4.` A bit holderfor cutterheads, consisting'of a block having a longitudinal bit receiving.` recess and .slots whereby one of the `side walls ofA said .recess is sub-divided into' a pluralityofwin'gs orleaves; and clamping `screws .engaging the individual; wings orl leaves.4

5. A bi't holder for cutter'heads, consist` ing of a groovedblock one side 'of which is subdivided. intol a plurality of bit engaging wings or leaves.

en weer head' having a' longitudine.

recess, in combination with abit holder-consisting of a grooved block one side-of which is'subdivided into a plurality of. bit engaging wings or'leaves, and. means wherebyl said wings or leaves may be individually tightened, f v

7. A cutter' head' having a 'longitudinal recess in combination. with a bit holder held in the recess and consisting of a block having a bit spanning groove anda plurality of bit engaging wings or leaves, a bit seated in the groove, and vclamping screwsl extending through the individual Wings or leavesand having heads, engaging a wall ofthe recess.

8. A cutter head having a longitudinal recess provided with longitudinal grooves in the bottom and in the rear wall thereof, a bit holder co. sisting of a block having a bit spanning groove, said block being adapted for engagement with the bottom groove of n the recess and provided with a tongue engaging the groove ir the back wall of the recess, and a clamping screw extending through one wall of the bit holder-and adapted for engagement with the front wall of the recess in the cutter head. 1

9.' A .cutter head having .longitudinal rer cesses providedwith grooves or offsets disposed approximately at right angles to each other, in combination with bit holdingfmembers slidably engaging the recesses and having portions engaging the grooves or offsets of said recesses, said .bitfholding members being provided with bit spanning grooves and with clamping screws, the opposite ends of which are adapted for engagement, respectively, with the bit and with a side wall of a recess in the cutter head.

l0. The. combination witha cutter head having longitudinal recesses, of bit holding members located in said recesses and having bit-spanning grooves, and clamping means engaging walls of the `recesses and the side Walls of the bit .holders for simultaneously clamping the latter upon the bitsand securing them in therecesses ofthe cutter head.A

. engagement with'theside faces of the bit.- i

` lWalls of the holder, and adapted for engagebits fitted in the grooves of the -bit holding g members, and means for clamping the latter upon the side faces of the bits. 12. The combination Witlia cutterl headl having alongitudinal recess, of`a bit holder'. f

.consisting'of a block having a bit-s anning g'roove and a narrow korf extending om the bottom of the latter in the direction of the back of the holder, Va bit seated in the groove of -the holder, and means engaging a side Wall of the recess in the cutter head, for springing the side. Walls of the. holder into 13. A cutter head havinga longitudinal lrece'ss, a bit holder engaging the/recess and 'having ai bit-spanning groove, adjustix g *screws `extending through, the back of the. holder into the bit-spanning groove, and clampingscrews engaging one of the side ment with a side. wall of -t e'ecessI in the cutter head. 14. A cutter head having a longitudinal recess, and a flattened portion adjacent to in the recess ofthe-eutte'if y 15. In a rotary cutter-: a ing a recessjin combinationvvi. v y engaging said recess-,'and-having a bit-'span- -ning groove, a bitseated thev groeve and clamping means engagi "g 'eutte'rihead to secure -the bit. liolderin position, :the said clamping meansengaging also the bit holder v'to clamp the latter `upon the bit.

a longitudinal recessV and bit holder engax; ing said recess and having a longitudinal' hit holder being provided with a grooved lor concaved edge. constituting a chip break.

17. A bit holder for rotarycutter heads? A Y LMER s. si-invmii; Witnesses;

W. H. Biicin,

`the frontl Wall of vthe said recess, in com- F. D. LoNGMoRE 16. ln'a rotary cutter head, a body having' spanning groove, the front Wall of said bit consisting cfa block having a bit-Spanningl n groove, and a chip break formed adjacent to 

